Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
Inventor
active
Alcohol soluble benzazole polymers
Alcohol soluble rigid-rod benzobisazole polymers
Hydroxy-pendent benzoxazole copolymers
Phosphonic acid-pendent benzoxazole copolymers
Rigid-rod benzobisazole copolymer containing cyclic phosphate es
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